JP3894549B2 - Transflective polarizing plate, reflective polarizing plate, and liquid crystal display device using them - Google Patents

Transflective polarizing plate, reflective polarizing plate, and liquid crystal display device using them Download PDF

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JP3894549B2
JP3894549B2 JP2002131517A JP2002131517A JP3894549B2 JP 3894549 B2 JP3894549 B2 JP 3894549B2 JP 2002131517 A JP2002131517 A JP 2002131517A JP 2002131517 A JP2002131517 A JP 2002131517A JP 3894549 B2 JP3894549 B2 JP 3894549B2
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polarizing plate
layer
transflective
light
reflective
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JP2003172809A (en
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和孝 原
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日東電工株式会社
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    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528Polarisers
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/30Polarising elements
    • G02B5/3025Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133553Reflecting elements
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133553Reflecting elements
    • G02F1/133555Transflectors
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00Materials and properties
    • G02F2202/22Antistatic materials or arrangements

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a transflective polarizing plate, a reflective polarizing plate, and a liquid crystal display device using the same used in a liquid crystal display device (hereinafter sometimes abbreviated as “LCD”).
[0002]
[Prior art]
LCDs are used in desktop electronic calculators, electronic watches, personal computers, word processors, and the like, and their demand is rapidly increasing in recent years, and transflective displays such as mobile phones and personal portable information terminals are growing rapidly.
[0003]
Conventionally, in order to improve the display characteristics of an LCD, a transflective polarizing plate in which a transflective plate is laminated on a polarizing plate is usually provided on the back side of a liquid crystal cell, and the liquid crystal display device is used in a relatively bright atmosphere. In some cases, incident light from the viewing side (display side) is reflected to display an image. When used in a relatively dark atmosphere, a backlight built in the back side of the transflective polarizing plate, etc. A method of displaying an image using a built-in light source is employed. That is, the transflective polarizing plate is useful for forming a liquid crystal display device because it can save energy for using a light source such as a backlight in a bright atmosphere and can be used with a built-in light source in a relatively dark atmosphere.
[0004]
[Problems to be solved by the invention]
However, the reflecting plate is bonded to a resin substrate or formed by vapor deposition / sputtering, and is used by bonding to an optical film such as a polarizing plate. FIG. 2 is a schematic cross-sectional view showing a configuration example of a conventional transflective reflector or reflector. On the light transmitting polymer substrate 11 made of resin (insulating material) such as PET, it has in the semi-transmissive reflective layer of metal thin film is formed reflective layer (conductor) 13, an adhesive over the layer A layer (insulator) 14 is formed to constitute a transflective plate or reflector 15. For this reason, the structure sandwiched with the insulators easily holds static electricity, and there is a risk of causing a fire or an electrical failure due to static electricity. In addition, due to the nature of the product, a “removable protective sheet with adhesive” (hereinafter abbreviated as “SPV”) is often attached to the back side substrate to prevent scratches. If only the activator is applied, there is a problem that the surfactant can be removed when the SPV is bonded and peeled off.
[0005]
Accordingly, the present invention, the order to solve the conventional problems, hardly taken during bonding and peeling of the SPV, a transflective type polarizing plate occurrence of that for static electricity is maintained difficult electrical failure can be prevented, the reflective polarizer and their An object of the present invention is to provide a liquid crystal display device using the.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a transflective polarizing plate of the present invention comprises a polarizing plate, an adhesive layer, a translucent reflective layer comprising a light-transmitting metal vapor-deposited film or metal thin film, and a light-transmitting polymer. A base material and an antistatic layer having a surface resistance value of 10 × 10 10 Ω or less are laminated in this order .
[0007]
In the transflective polarizing plate of the present invention, the antistatic layer is preferably formed of a conductive polymer.
[0008]
In the transflective polarizing plate of the present invention, the antistatic layer is preferably formed from a resin binder to which a conductive filler is added.
[0009]
In the transflective polarizing plate of the present invention, the antistatic layer preferably has a peel strength of 0.5 N / 25 mm or more.
[0010]
In the transflective polarizing plate of the present invention, it is preferable that the light transmittance of the antistatic layer is 70% or more.
[0011]
In the transflective polarizing plate of the present invention, the light transmissive polymer base material is preferably formed from polyethylene terephthalate.
[0012]
Next, the reflective polarizing plate of the present invention has a polarizing plate, an adhesive layer, a reflective layer made of a metal vapor-deposited film or a metal thin film, a light-transmitting polymer substrate, and a surface resistance value of 10 × 10 10. An antistatic layer having a resistance of Ω or less is laminated in this order.
[0013]
In the reflective polarizing plate of the present invention, the antistatic layer is preferably formed of a conductive polymer.
[0014]
Moreover, in the reflective polarizing plate of this invention, it is preferable that the said antistatic layer is formed from the resin binder which added the conductive filler.
[0015]
Moreover, in the reflective polarizing plate of this invention, it is preferable that the peeling strength of the said antistatic layer is 0.5 N / 25mm or more.
[0016]
In the reflective polarizing plate of the present invention, the light-transmitting polymer base material is preferably formed from polyethylene terephthalate.
[0017]
The liquid crystal display device of the present invention is characterized in that the transflective polarizing plate or the reflective polarizing plate is disposed on at least one surface of a liquid crystal cell. In this liquid crystal display device, the transflective polarizing plate or the reflective polarizing plate has an antistatic layer formed on the transflective polarizing plate or the reflective polarizing plate on the display back side of the liquid crystal display device. It is preferable that they are arranged as described above.
[0018]
Further, the present invention is a method for producing the transflective polarizing plate of the present invention,
The manufacturing method prepares a laminate of a light-transmitting metal vapor-deposited film or a translucent reflective layer made of a metal thin film, and a light-transmitting polymer substrate,
An antistatic layer is formed by applying a conductive paint containing a conductive polymer or a conductive filler having a surface resistance value of 10 × 10 10 Ω or less on the light-transmitting polymer substrate of the laminate. And
An adhesive is applied on the transflective layer of the laminate to form an adhesive layer,
The method includes a step of laminating a polarizing plate on the pressure-sensitive adhesive layer to obtain a transflective polarizing plate.
[0019]
Further, the present invention is a method for producing the reflective polarizing plate of the present invention,
The manufacturing method prepares a laminated body of a reflective layer composed of a metal vapor-deposited film or a metal thin film and a light-transmitting polymer base material,
An antistatic layer is formed by applying a conductive paint containing a conductive polymer or a conductive filler having a surface resistance value of 10 × 10 10 Ω or less on the light-transmitting polymer substrate of the laminate. And
An adhesive is applied on the reflective layer of the laminate to form an adhesive layer,
The method includes a step of laminating a polarizing plate on the pressure-sensitive adhesive layer to obtain a reflective polarizing plate.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
The transflective polarizing plate or reflective polarizing plate of the present invention includes a polarizing plate, an adhesive layer, a transflective layer comprising a light-transmitting metal vapor-deposited film or metal thin film, and a light-transmitting polymer substrate. And an antistatic layer having a surface resistance value of 10 × 10 10 Ω or less laminated in this order, or a polarizing plate, an adhesive layer, a reflective layer made of a metal vapor-deposited film or a metal thin film, A light-transmitting polymer base material and an antistatic layer having a surface resistance value of 10 × 10 10 Ω or less are laminated in this order. When the surface resistance value is larger than 10 × 10 10 Ω, static electricity is likely to be accumulated on the reflector, which may cause a fire or electrical failure due to static electricity, which is not preferable. The surface resistance value is preferably 10 × 10 8 Ω or less, more preferably 10 × 10 7 Ω or less.
[0021]
As the light-transmitting polymer substrate, resins such as polyethylene terephthalate (PET), polycarbonate (PC), polyethersulfone (PES), polyvinyl alcohol (PVA), and triacetyl cellulose (TAC) can be used. The thickness is not particularly limited, but is usually 6 to 100 μm.
[0022]
The semi-transmissive reflective layer or the reflective layer is formed from a metal vapor deposition film or a metal thin film. Examples of the metal that can be used for the metal vapor deposition film and the metal thin film include aluminum, silver, a silver-palladium alloy, and chromium.
[0023]
The antistatic layer is not particularly limited as long as the antistatic layer satisfies the above-mentioned characteristics, but in order to prevent dropping at the time of SPV laminating or peeling, a resin binder to which a conductive polymer or a conductive filler is added. It is preferable that a conductive layer made of is formed. In the transflective plate, the antistatic layer preferably has a light transmittance of 70% or more, and more preferably 80% or more. Although the thickness of an antistatic layer is not specifically limited, Usually, it is 0.1-50 micrometers.
[0024]
The conductive polymer is not particularly limited, and all conventionally known conductive polymers such as polyaniline, polyacetylene, and various doping materials obtained by ion doping these polymers can be used. Examples of the conductive filler include indium oxide, tin oxide, zinc oxide and ATO (antimony tin oxide).
[0025]
The method for forming the antistatic layer is not particularly limited. For example, the antistatic layer is formed by applying a conductive paint containing a conductive polymer or a conductive filler to a light-transmitting polymer substrate and drying it. be able to. A commercially available conductive paint can also be used.
[0026]
In addition, the antistatic layer is used when the EL backlight, the diffusing member, and the prism sheet are directly attached to the back side, and the adhesion to the light-transmitting polymer substrate is expressed as the peel strength. The value is 0.5 N / 25 mm or more, preferably 2 N / 25 mm or more, more preferably 5 N / 25 mm or more.
[0027]
FIG. 1 shows a configuration example of a transflective plate (or a reflective plate) included in the transflective polarizing plate of the present invention. A semi-transmissive reflective layer (or reflective layer) 3 is formed on the light transmissive polymer substrate 1, and an adhesive layer 4 is formed thereon. The layer 2 is formed to constitute a transflective reflector (or reflector) 5. When this is mounted on a display device, the anti-static layer of the transflective reflector (or reflector) 5 is provided so that when charged, the charges can move smoothly to the ground and the static electricity can be easily removed. Arrange it so that it is on the display back side.
[0028]
The transflective polarizing plate of the present invention is a laminate of the transflective plate and the polarizing plate, and the reflective polarizing plate is a laminate of the reflector and the polarizing plate. In addition, suitable adhesion means, such as an adhesive, can be used for bonding.
[0029]
The polarizing plate used in the present invention is not particularly limited, but the basic constitution thereof is an appropriate adhesive layer such as a vinyl alcohol type on one or both sides of a polarizer made of a dichroic substance-containing polyvinyl alcohol polarizing film or the like. It consists of what adhered the transparent protective film used as a protective layer through the adhesive layer which consists of polymers etc.
[0030]
As a polarizer (polarizing film), for example, a film made of a vinyl alcohol polymer such as polyvinyl alcohol or partially formalized polyvinyl alcohol, a dyeing process or a stretching process or a crosslinking with a dichroic substance such as iodine or a dichroic dye. Appropriate processing such as processing can be performed in an appropriate order and method, and an appropriate material that transmits linearly polarized light when natural light is incident can be used. In particular, those excellent in light transmittance and degree of polarization are preferable.
[0031]
An appropriate transparent film can be used as a protective film material to be a transparent protective layer provided on one side or both sides of a polarizer (polarizing film). As an example of the polymer, an acetate-based resin such as triacetyl cellulose is generally used, but is not limited thereto.
[0032]
A transflective polarizing plate is usually provided on the back side of a liquid crystal cell, and displays an image by reflecting incident light from the viewing side (display side) when a liquid crystal display device is used in a relatively bright atmosphere. In a relatively dark atmosphere, a liquid crystal display device or the like that displays an image using a built-in light source such as a backlight built in the back side of the transflective polarizing plate can be formed. In other words, the transflective polarizing plate is useful for forming a liquid crystal display device of a type that can save energy of using a light source such as a backlight in a bright atmosphere and can be used with a built-in light source even in a relatively dark atmosphere. It is.
[0033]
The reflective polarizing plate is usually disposed on the back side of the liquid crystal cell, and can form a liquid crystal display device (reflective liquid crystal display device) or the like of a type that reflects incident light from the viewing side (display side). In other words, the reflective polarizing plate has advantages such that the incorporation of a light source such as a backlight can be omitted and the liquid crystal display device can be easily thinned.
[0034]
The transflective polarizing plate and reflective polarizing plate of the present invention can be provided with an adhesive layer for adhering to a member such as a liquid crystal cell. The pressure-sensitive adhesive used for forming the pressure-sensitive adhesive layer is not particularly limited, and for example, an appropriate material such as acrylic, silicone, polyester, polyurethane, polyether, or rubber can be used. What is necessary is just to provide an adhesion layer in a required surface as needed. There is no limitation in particular also about the thickness of an adhesion layer, and it is 10-30 micrometers normally.
[0035]
In addition, when exposed on the surface, it is preferable to cover with the separator (release film) for the purpose of contamination prevention etc. until the adhesion layer is put to practical use. The separator can be formed by a method in which an appropriate thin leaf is coated with a release agent such as silicone, long-chain alkyl, fluorine, or molybdenum sulfide as necessary.
[0036]
In the liquid crystal display device of the present invention, the transflective polarizing plate or the reflective polarizing plate is disposed on at least one surface of a liquid crystal cell.
[0037]
This liquid crystal display device can be formed as having an appropriate structure according to the prior art in which polarizing plates are arranged on one side or both sides of a liquid crystal cell. Accordingly, the liquid crystal cell forming the liquid crystal display device is arbitrary. For example, an active matrix driving type typified by a thin film transistor type, a simple matrix driving type typified by a twist nematic type or a super twist nematic type, etc. Any type of liquid crystal cell may be used.
[0038]
In forming the liquid crystal display device, for example, appropriate components such as a prism array sheet, a lens array sheet, a light diffusion plate, and a backlight can be arranged in one or more layers at appropriate positions.
[0039]
【Example】
Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to only these Examples.
[0040]
Example 1
On a reflector (product of Toyo Aluminum, trade name “Alpet 50”; aluminum foil thickness 15 μm, PET substrate thickness 50 μm), conductive polymer antistatic agent (manufactured by Bayer, conductive paint “Detron”) ) Was applied to form an antistatic layer having a thickness of 0.2 μm. The surface resistance value of this antistatic layer was 6 × 10 5 Ω. A polarizing plate (manufactured by Nitto Denko Corporation, trade name “F1205”) was bonded to this with a 25 μm thick adhesive to obtain a reflective polarizing plate. The adhesive layer provided on the polarizing plate was covered with a release film until it was practically used. FIG. 3 schematically shows a cross-sectional configuration of the reflective polarizing plate. In this configuration, the aluminum foil is insulatively sandwiched between an adhesive and a PET base material.
[0041]
About the reflection type polarizing plate, the adhesion strength (peeling strength) of the antistatic layer to the PET substrate was measured by performing a 180 degree peel test at a peeling speed of 0.3 m / min using a universal tensile tester / Tensilon. As a result, it was 2.4 N / 25 mm.
[0042]
Next, when the roll product of this example was unwound through a metal roll, the charge amount was stopped at 500V.
[0043]
(Example 2)
Conductive filler (SnO 2 ) -dispersed conductive paint (trade name “P3001”, manufactured by Catalyst Chemical Co., Ltd.) on a silver-deposited transflective reflector (transmittance 10%, reflectivity 70%, PET substrate thickness 50 μm) ) To form an antistatic layer having a thickness of 1 μm and a light transmittance of 80%. The surface resistance value of this antistatic layer was 10 × 10 6 Ω. A polarizing plate (manufactured by Nitto Denko Co., Ltd., trade name “F1205”) was bonded to this with an adhesive having a thickness of 25 μm to obtain a transflective polarizing plate. In this configuration, the silver deposited film is insulatively sandwiched between the adhesive and the PET base material.
[0044]
About the said antistatic layer, when it carried out similarly to Example 1 and measured the adhesive force (peeling strength) to a base material by a 180 degree | times peel test, it was 2 N / 25mm or more.
[0045]
Next, when the roll product of this example was unwound through a metal roll, the charge amount was stopped at 500V.
[0046]
In addition, a protective sheet with a releasable pressure-sensitive adhesive (manufactured by Nitto Denko Corporation, “SPV-PPF100T”) is bonded to the transflective polarizing plate obtained above and autoclaved (50 ° C., 5 × 10 5 Pa, 20 And the antistatic layer did not fall off.
[0047]
Example 3
Conductive filler-dispersed conductive paint (trade name “Syntron D600”, manufactured by Shinto Paint Co., Ltd.) is applied to a silver-deposited transflective reflector (transmittance 10%, reflectivity 70%, PET substrate thickness 50 μm). This was applied to form an antistatic layer having a thickness of 20 μm and a light transmittance of 70%. The surface resistance value of this antistatic layer was 10 × 10 10 Ω. A polarizing plate (manufactured by Nitto Denko Co., Ltd., trade name “F1205”) was bonded to this with an adhesive having a thickness of 25 μm to obtain a transflective polarizing plate. In this configuration, the silver deposited film is insulatively sandwiched between the adhesive and the PET base material.
[0048]
About the said antistatic layer, when it carried out similarly to Example 1 and measured the adhesive force (peeling strength) to a base material by a 180 degree | times peel test, it was 2 N / 25mm or more.
[0049]
Next, when the roll product of this example was unwound through a metal roll, the charge amount was stopped at 500V.
[0050]
A protective sheet with a releasable pressure-sensitive adhesive (“SPV-PPF100T” manufactured by Nitto Denko Corporation) is bonded to the transflective polarizing plate obtained above and autoclaved (50 ° C., 5 × 10 5 Pa, 20 And the antistatic layer did not fall off.
[0051]
Example 4
An easy adhesion treatment by saponification was performed on a silver-deposited transflective reflector (transmittance 10%, reflectivity 70%, PET base material thickness 50 μm). Polyaniline (conducting polymer, containing 10% by weight of binder resin) was applied thereto to form an antistatic layer having a thickness of 0.1 μm and a light transmittance of 80%. The surface resistance value was 10 × 10 10 Ω. A polarizing plate (manufactured by Nitto Denko Co., Ltd., trade name “F1205”) was bonded to this with an adhesive having a thickness of 25 μm to obtain a transflective polarizing plate. In this configuration, the silver deposited film is insulatively sandwiched between the adhesive and the PET base material.
[0052]
About the said antistatic layer, when it carried out similarly to Example 1 and measured the adhesive force (peeling strength) to a base material by a 180 degree | times peel test, it was 2 N / 25mm or more.
[0053]
Next, when the roll product of this example was unwound through a metal roll, the charge amount was stopped at 500V.
[0054]
A protective sheet with a releasable pressure-sensitive adhesive (“SPV-PPF100T” manufactured by Nitto Denko Corporation) is bonded to the transflective polarizing plate obtained above and autoclaved (50 ° C., 5 × 10 5 Pa, 20 And the antistatic layer did not fall off.
[0055]
In the present invention products shown in Examples 1 to 4, as shown in FIG. 3, the aluminum foil or the silver deposited film 3 is sandwiched between the pressure-sensitive adhesive 4 and the PET substrate 1 and insulated. Nevertheless, it can be seen that the amount of charge is small. This is presumably because, even when the substrate is charged, the charge moves to the grounded portion of the surface, and the static electricity can be removed. Also, since the electric charge gradually escapes, it is difficult for the spark to fly.
[0056]
(Comparative Example 1)
A polarizing plate (manufactured by Nitto Denko Co., Ltd.) on a reflector (made by Toyo Aluminum Co., Ltd., trade name “Alpet 50”; aluminum foil thickness 15 μm, PET substrate thickness 50 μm) with a 25 μm thick adhesive. The product name “F1205”) was bonded to obtain a reflective polarizing plate. The adhesive layer provided on the polarizing plate was covered with a release film until it was practically used. FIG. 4 schematically shows a cross-sectional configuration of the reflective polarizing plate. In this configuration, the aluminum foil is insulatively sandwiched between an adhesive and a PET base material.
[0057]
Next, when the roll product of this example was unwound through a metal roll, the charge amount reached 1000 V or more.
[0058]
(Comparative Example 2)
A polarizing plate (manufactured by Nitto Denko Co., Ltd.) on a reflector (made by Toyo Aluminum Co., Ltd., trade name “Alpet 50”; aluminum foil thickness 15 μm, PET substrate thickness 50 μm) with a 25 μm thick adhesive. The product name “F1205”) was pasted. A surfactant-based antistatic agent (manufactured by Sumitomo Chemical Co., Ltd., “SB-8”) was sprayed on the back surface of the PET substrate. The surface electrical resistance after the treatment was about 10 × 10 10 Ω and had a sufficient antistatic effect, but for the purpose of preventing scratches on the back surface, a protective sheet with a releasable adhesive (manufactured by Nitto Denko Corporation, When “SPV-PPF100T”) was bonded and peeled off, the antistatic agent was peeled off by the SPV adhesive and the antistatic effect was lost.
[0059]
In the reflective polarizing plates shown in Comparative Examples 1 and 2, as shown in FIG. 4, the aluminum foil 13 is in an insulated state sandwiched between the adhesive 14 and the PET base material 11, and the base material is When charged, it becomes a capacitor between the PET film and the aluminum foil, so that it is difficult for static electricity to move on the surface of the substrate and to escape. In addition, even when grounding, static electricity can be removed only at the grounded location, and static electricity remains at other locations. In addition, grounding the aluminum foil can remove static electricity, but the charge transfer is too fast, causing a large current to flow at once and sparks to fly.
[0060]
【The invention's effect】
As described above, according to the present invention, since the antistatic layer is formed on the back surface of the translucent reflective base material or the light transmissive polymer base material on which the reflective layer is laminated, static electricity is not accumulated, It is possible to provide a transflective polarizing plate or a reflective polarizing plate that does not cause an electrical failure. Further, even when SPV is bonded and peeled off, the antistatic layer does not fall off, which is effective when mounted on a liquid crystal display device.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing a configuration example of a transflective plate (reflective plate) included in a transflective polarizing plate of the present invention.
FIG. 2 is a schematic cross-sectional view showing a configuration example of a conventional transflective plate.
FIG. 3 is a schematic cross-sectional view showing a configuration example of a reflective polarizing plate (semi-transmissive polarizing plate) of the present invention.
FIG. 4 is a schematic cross-sectional view showing a configuration example of a reflective polarizing plate of a comparative example.
[Explanation of symbols]
1 Light-transmissive polymer substrate 2 Antistatic layer (conductive layer)
3 Transflective layer (reflective layer)
4 Adhesive layer 5 Transflective reflector (reflector)
6 Polarizing plate 7 Release film 8 Transflective polarizing plate (Reflective polarizing plate)
DESCRIPTION OF SYMBOLS 9 Ground 11 Light transmissive polymer base material 13 Semi-transmissive reflective layer 14 Adhesive layer 15 Semi-transmissive reflective plate 16 Polarizing plate 17 Release film 18 Reflective polarizing plate 19 Ground

Claims (14)

  1.   A polarizing plate, an adhesive layer, a translucent reflective layer made of a light-transmitting metal vapor-deposited film or metal thin film, a light-transmitting polymer substrate, and a surface resistance value of 10 × 10 Ten A transflective polarizing plate characterized by laminating an antistatic layer of Ω or less in this order.
  2. The transflective polarizing plate according to claim 1, wherein the antistatic layer is formed of a conductive polymer.
  3. The transflective polarizing plate according to claim 1, wherein the antistatic layer is formed from a resin binder to which a conductive filler is added.
  4. The transflective polarizing plate according to claim 1, wherein the antistatic layer has a peel strength of 0.5 N / 25 mm or more.
  5. The transflective polarizing plate according to claim 1, wherein the antistatic layer has a light transmittance of 70% or more.
  6.   The transflective polarizing plate according to any one of claims 1 to 5, wherein the light transmissive polymer substrate is formed from polyethylene terephthalate.
  7.   A polarizing plate, an adhesive layer, a reflective layer made of a metal vapor-deposited film or a metal thin film, a light-transmitting polymer substrate, and a surface resistance value of 10 × 10 Ten A reflection type polarizing plate characterized by laminating an antistatic layer of Ω or less in this order.
  8. The reflective polarizing plate according to claim 7, wherein the antistatic layer is formed of a conductive polymer.
  9. The reflective polarizing plate according to claim 7, wherein the antistatic layer is formed from a resin binder to which a conductive filler is added.
  10. The reflective polarizing plate according to claim 7, wherein the antistatic layer has a peel strength of 0.5 N / 25 mm or more.
  11.   The reflective over-type polarizing plate according to any one of claims 7 to 10, wherein the light-transmitting polymer substrate is formed from polyethylene terephthalate.
  12. A liquid crystal display device comprising the transflective polarizing plate according to any one of claims 1 to 6 or the reflective polarizing plate according to any one of claims 7 to 11 arranged on at least one surface of a liquid crystal cell. .
  13. It is a manufacturing method of the transflective polarizing plate according to claim 1,
      The manufacturing method prepares a laminate of a light-transmitting metal vapor-deposited film or a metal thin film and a light-transmitting polymer base material,
      On the light-transmitting polymer base material of the laminate, the surface resistance value is 10 × 10 Ten Applying a conductive paint containing a conductive polymer or conductive filler that is Ω or less to form an antistatic layer,
      An adhesive is applied on the transflective layer of the laminate to form an adhesive layer,
      The manufacturing method including the process of laminating | stacking a polarizing plate on the said adhesive layer and obtaining a transflective polarizing plate.
  14. It is a manufacturing method of the reflective polarizing plate according to claim 7,
      The manufacturing method prepares a laminate of a reflective layer made of a metal vapor-deposited film or a metal thin film, and a light-transmitting polymer base material,
      On the light-transmitting polymer base material of the laminate, the surface resistance value is 10 × 10 Ten An antistatic layer is formed by applying a conductive paint containing a conductive polymer or conductive filler that is Ω or less,
      Applying an adhesive on the reflective layer of the laminate to form an adhesive layer,
      A production method comprising a step of laminating a polarizing plate on the pressure-sensitive adhesive layer to obtain a reflective polarizing plate.
JP2002131517A 2001-09-26 2002-05-07 Transflective polarizing plate, reflective polarizing plate, and liquid crystal display device using them Expired - Fee Related JP3894549B2 (en)

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JP2001-294930 2001-09-26
JP2001294930 2001-09-26
JP2002131517A JP3894549B2 (en) 2001-09-26 2002-05-07 Transflective polarizing plate, reflective polarizing plate, and liquid crystal display device using them

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2002131517A JP3894549B2 (en) 2001-09-26 2002-05-07 Transflective polarizing plate, reflective polarizing plate, and liquid crystal display device using them
US10/253,436 US6965418B2 (en) 2001-09-26 2002-09-25 Semi-transmitting reflective plate, reflective plate, semi-transmitting polarizer, reflective polarizer and liquid crystal display using same
KR1020020058407A KR100841844B1 (en) 2001-09-26 2002-09-26 Semi-transmitting reflective plate, reflective plate, semi-transmitting polarizer, reflective polarizer and liquid crystal display using same
CNB021434484A CN1281978C (en) 2001-09-26 2002-09-26 Semipermeable reflective plate and reflective plate and semipermeable polazied plate and reflective polazied plate and liquid crystal display
TW091122168A TW571125B (en) 2001-09-26 2002-09-26 Semi-transmitting reflective plate, reflective plate, semi-transmitting polarizer, reflective polarizer and liquid crystal display using same

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JP3894549B2 true JP3894549B2 (en) 2007-03-22

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KR20030027747A (en) 2003-04-07
TW571125B (en) 2004-01-11
KR100841844B1 (en) 2008-06-27
JP2003172809A (en) 2003-06-20
CN1281978C (en) 2006-10-25
CN1409130A (en) 2003-04-09
US6965418B2 (en) 2005-11-15

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